There's the Italian word serramento which means "a window or a door", used in this way for example:
Our company produces [serramenti] in aluminium.
Is there an equivalent word or expression that refers to doors and windows in general in English?
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It is common to use the phrase 'doors and windows' as a class of objects that is part of a construction (typically part of what is known as joinery and woodwork). This suggests that there is no widely used and understood single word for this purpose.
In certain technical contexts, doors, windows, ventilators, etc., are collectively referred to as 'openings'. (I could say openings increase the cost of a concrete structure.) You will notice that openings could be understood to be framed (in wood, metal, etc.,), rather than just an absence of material.
I'd think that ingresses or egresses fit the bill, so long as the windows in question can be used to enter/exit. It is a slightly more narrow definition in that I guess it technically doesn't cover tiny windows or windows that don't open/close, but I've used it myself frequently and people typically understand what I mean.
Perhaps not entirely professional, but I have seen the term Windoors being used in software systems to cover windows, doors, skylight and glass panes. In your case I think the only real solution is to write "windows and doors", because it would otherwise sound unprofessional.
I do agree however, that it would be nice to have a collective term that is more detailed than "openings" (not include e.g. ventilation openings), more collective than "portals" (include e.g. fixed windows) and more professional than "windoors".
Terms used to refer to multiple different types of openings (including doors, windows, and through-holes for piping/ventilation) as found in certain building codes throughout the english-speaking world are "PORT", "PORTAL", "FENESTRA", or "FENESTRATION". Click to see definitions on dictionary.com